Instruments

Adler Planetarium - Historical Collections
Collection of instruments, past exhibitions, history department information.
http://www.adlerplanetarium.org/history/

Antique Telescopes
An overview with photographs of many lesser known telescopes typical of their time.
http://www.antiquetelescopes.org/

The Astrolabe
Ancient astronomical computer.
http://astrolabes.org/astrolab.htm

Caltech Astronomy - History
The telescopes at Mt. Wilson and Palomar.
http://www.astro.caltech.edu/observatories/palomar/history/

Churches as Scientific Instruments
Solar observatories built into 17th and 18th century cathedrals.
http://cis.alma.unibo.it/NewsLetter/090496Nw/Heilbron.htm

The 28-inch Photo-visual Refractor
Exhibition from the Royal Observatory, Greenwich, that explains the history of this telescope via words and archive photographs.
http://www.nmm.ac.uk/server.php?request=setTemplate:singlecontent&contentTypeA=conWebDoc&contentId=354&navId=005001004

Sir Martin Ryle - Nobel Lecture
Radio telescopes of large resolving power.
http://nobelprize.org/physics/laureates/1974/ryle-lecture.html

400th Anniversary of the Invention of the telescope
Circumstances of the invention, instructions for making a model, and commemorative events in Middelburg, the Netherlands. [Dutch and English]
http://www.inventionofthetelescope.eu/

Virtual Museum of Measuring Engines
The history of modern astronomical measurement, emphasis on instruments.
http://www.astro.virginia.edu/~afs5z/engines.html